There are two types of common car jack, one is rack Jack and the other is screw jack.

The common feature of these two types of jacks is that they are small in size, do not occupy space, and are suitable for placing in the trunk.

1、 Rack Jack. The rack jack is composed of three parts: rack, gear and rotating mechanism. It rotates the rack by the rotating mechanism, holds up the supporting part of the jack, and thus lifts the vehicle.

2、 Screw jack. The screw jack is self-locking by its own thread structure to support the vehicle, and its support weight is much larger than that of the rack Jack.

3、 Hydraulic jack. This kind of Jack relies on the hydraulic oil driving force and uses the Pascal principle to make the lifting of heavy objects easier.